FORPOLYMER WITH TERMINAL ISOCYANATE GROUPS, METHOD OF OBTAINING THEREOF AND THEREOF APPLICATION Russian patent published in 2015 - IPC C08G18/10 C08G18/12 C08G18/76 

FIELD: chemistry.

SUBSTANCE: invention relates to forpolymer with terminal isocyanate groups, method of its obtaining, to elastic foam polyurethane, method of its obtaining and its application. Method of obtaining forpolymer with terminal isocyanate groups consists in the following: reaction of interaction of the following components is carried out: a1) 45-65 wt % of diphenylmethanediisocyanate counted per 100 wt % of forpolymer, where diphenylmethanediisocyanate contains 50-79 wt % of 4,4'-diphenylmethanediisocyanate counted per 100 wt % of diphenylmethanediisocyanate; a2) 25-45 wt % of polymethylenepolyphenylpolyisocyanate counted per 100 wt % of forpolymer, a3) 5-20 wt % of polyetherpolyol counted per 100 wt % of forpolymer. The average functionality of polyetherpolyol (a3) constitutes 2-6, the average molecular weight constitutes 2000-10000, the average content of ethyleneoxide in polyetherpolyol constitutes 22-43 wt % counted per 100 wt % of polyetherpolyol. Content of NCO in forpolymer constitutes 21-30 wt % counted per 100 wt % of forpolymer. Method of obtaining elastic foam polyurethane consists in the following: reaction of interaction of components A, B and C is carried out. Reaction NCO-index constitutes 70-120. Component A represents said forpolymer with terminal isocyanate groups. Component B represents polyol, containing: b1) 0.1-20 wt.p. of at least first polyoxyethylenepolyoxypropylenepolyol counted per 100 wt % of B and C, where functionality of first polyoxyethylenepolyoxypropylenepolyol is integer number, equal or larger than 2, and the average content of ethyleneoxide in first polyoxyethylenepolyoxypropylenepolyol is equal or is larger than 50 wt%, b2) 30-90 wt.p. of second polyoxyethylenepolyoxypropylenepolyol counted per 100 wt % of B and C, where hydroxyl number of second polyoxyethylenepolyoxypropylenepolyol constitutes 25-40 mg/KOH, and the average content of ethyleneoxide in second polyoxyethylenepolyoxypropylenepolyol is equal or is lower than 30 wt %, b3) 5-60 wt.p. of polymer polyol, b4) 0.01-15 wt.p. of chain extender, b5) 0.01-20 wt.p. of catalyst and/or foam stabiliser. Component C is represented by water. Obtained elastic foam polyurethane is applied in production of fittings, cushioning element or automobile.

EFFECT: invention makes it possible to increase physical and mechanical properties of elastic foam polyurethane, as well as to reduce time and temperature of withdrawing polyurethane from mould.

13 cl, 2 tbl, 12 ex